This research aimed at evaluating the quality of bonded joints of Eucalyptus wood by using different faces and adhesives to produce EGP (Edge Glued Panels). Glue line shear specimens were obtained from bonded joints glued with PVAc (Polyvinyl Acetate) and EPI (Emulsion Polymer Isocyanate) adhesives, using pieces oriented with tangential, radial and intermediary faces, as well as the combination between them. The specimens were submitted to two pretreatments in order to simulate the use of joints in dry and wet environments. For shear tests, 12 treatments were obtained. The results indicated that the use of tangential x tangential and tangential x intermediary bonding faces and EPI adhesive presented better glue line shear strength for EGP in dry and wet pretreatments, respectively. The joints bonded in the radial x radial direction presented statistically inferior values when compared to the other treatments.

The basic density is the main technical property of the wood due to the fact of the easy determination and correlation with the others wood properties. In this article, it was evaluated wood chips from a five-years-old Eucalyptus grandis in three different silvicultural treatments for pulp and paper production. First, a conventional kraft pulping was executed in the same conditions and then submitted to some elemental chlorine free (ECF) bleaching process to achieve the target brightness of 88 ± 1% ISO. The bleached pulps were refined in a Jokro Mill at 0, 2250, 4500 and 6750 revolutions and their physical, mechanical and optical properties were analyzed. The statistical analysis indicated a difference in the wood basic density from the different silvicultural treatments. The yield of the pulping process was not affected by the variation of the wood basic density. The denser wood had the advantage of a lower specific wood consumption while the disadvantage was a greater difficulty in the delignification and a decrease in the selectivity of the pulping process. The denser wood was the one with the best bleachability and the one that most consumed chlorine in the bleaching process. The increase of the wood density caused gains in the fisical and optical properties of the bleached pulp and losses in the mechanical properties.The optical properties of the pulps from denser woods are more resistant than the negative effects of mechanical properties.

ESTIMATIVA DO COEFICIENTE DE TRANSFERÊNCIA DE MASSA E VALIDAÇÃO DE UM MODELO DINÂMICO NÃO LINEAR PARA UM SECADOR SOLAR   VICTOR GONÇALVES CREMONEZ1, DILE PONTAROLO STREMEL2, JORGE LUIS MONTEIRO DE MATOS3, RICARDO JORGE KLITZKE4   1 Departamento de Engenharia e Tecnologia Florestal, Universidade Federal do Paraná, Avenida Lothário Meissner, 632, Jardim Botâmico, Curitiba, Paraná, Brasil. Faculdade de Tecnologia de Curitiba – FATEC-PR, Itacolomi, 450, Portão, Curitiba, Paraná, Brasil. E-mail: victor.cremonez@gmail.com; direcaoacademica@fatecpr.edu.br 2 Departamento de Engenharia e Tecnologia Florestal, Universidade Federal do Paraná, Avenida Lothário Meissner, 632, Jardim Botâmico, Curitiba, Paraná, Brasil, E-mail: dile.stremel@gmail.com 3 Departamento de Engenharia e Tecnologia Florestal, Universidade Federal do Paraná, Avenida Lothário Meissner, 632, Jardim Botâmico, Curitiba, Paraná, Brasil, E-mail: mailjmatos.ufpr.br 4 Departamento de Engenharia e Tecnologia Florestal, Universidade Federal do Paraná, Avenida Lothário Meissner, 632, Jardim Botâmico, Curitiba, Paraná, Brasil. E-mail: rjkklitzke@gmail.com   RESUMO: O objetivo deste trabalho foi estimar o coeficiente de transferência de massa e validar um modelo dinâmico não linear para um secador solar de madeira e biomassa. Para tal, foi construída uma estufa solar para secagem de madeira serrada e biomassa, com aproximadamente 1m³ de capacidade. Na estufa, foram secas tábuas de Eucalyptus spp.. Para a modelagem dinâmica foi proposto um balanço dinâmico em torno do material sólido, levando em conta a perda cinética da taxa de secagem em que esta depende do coeficiente de transferência de massa, parâmetro este que será ajustado levando em consideração a dinâmica do ambiente de secagem. Na otimização, foi utilizado o método dos mínimos quadrados não linear. Como resultado, foi possível elaborar um modelo dinâmico para a perda de umidade em relação ao tempo na secagem solar, bem como o coeficiente de transferência de massa. É possível concluir que o coeficiente de transferência de massa e os modelos encontrados podem ser utilizados para estimar os parâmetros de secagem em outras condições ambientais, como outra época do ano, outra cidade ou até outro país, melhorando assim as perspectivas do uso da secagem solar no meio rural.   Palavras-chave: taxa de secagem, secagem de madeira, secagem de biomassa.   ESTIMATION OF MASS TRANSFER COEFFICIENT AND VALIDATION OF A NON-LINEAR DYNAMIC MODEL FOR A SOLAR DRYER   ABSTRACT: The aim of this work was to estimate the mass transfer coefficient and to validate a dynamic non-linear model for a solar wood and biomass dryer. For this purpose, a solar dryer greenhouse was built to dry sawn wood and biomass, with approximately 1m³ of capacity. In the solar dryer, were dried boards of Eucalyptus spp.. For dynamic modeling, a dynamic balance around the solid material was proposed, taking into account the kinetic loss of the drying rate, which depends on the mass transfer coefficient, a parameter that will be adjusted taking into account the dynamics of the drying environment. in optimization, the nonlinear least squares method was used. As a result, it was possible to develop a dynamic model for the loss of moisture in relation to time in solar drying, as well as the mass transfer coefficient. It is possible to conclude that the mass transfer coefficient and the models found can be used to estimate drying parameters in other environmental conditions, such as: another time of the year, another city or even in another country, thus improving the prospects for the use of solar drying in rural areas.   Keywords: drying rate, wood drying, biomass drying.

Eucalyptus grandis wood was thermally treated at two different temperatures (150 °C and 200 °C) in a muffle furnace with steam. The surface color change was measured right after the treatment and in wood samples stored for two years inside a carton box without light exposure. Samples were analyzed by thermogravimetry to detect variation of thermal degradation behavior for different treatment temperatures. Thermally treated wood was darker when compared to control samples. The storage time influenced the wood surface color, with the surface becoming darker and redder. Thermogravimetric analysis revealed a peak of wood degradation between 300 °C and 400 °C for thermally treated samples.